Levin, Gilbert

Ferguson and Bowman 1990 Gilbert and Rice 1987 Hopper et al. 1986 Krasovskii et al. 1979 Levin et al. 1988 Massaro and Massaro 1987 Overmann 1977 Rice 1985a). It appears that animals are affected at roughly the same blood lead levels as humans. Measured neurotoxic effects in animals include significantly delayed motor function and reflexes, decreased performance on learning tasks, and impaired spatial discrimination. Additional animal studies are needed to investigate the neurotoxic effects of subchronic inhalation exposures to establish external dose-effect relationships. 

We would like to thank the following people for reviewing parts of the manuscript and for providing helpful comments Professors D. E. Applequist, C. W. Beck, J. C. Gilbert, R. W. Holder, W, P. Jencks, J. R. Keeffe, C. Levin, F. B. Mallory, D. R. McKelvey, N. A. Porter, P. v. R. Schleyer, J. Swenton, and T. T. Tidwell. We are particularly grateful to Professor N. A. Porter, who reviewed and commented on the entire manuscript. We owe special thanks to Professor Charles Levin for many enlightening discussions and to Carol Dempster for essential help and encouragement. 

The conflicting serial/parallel models for IVR/VP are not readily distinguished until time resolved experiments can be performed on the systems of interest. Both models can relate the relative intensities of the emission features to the various model parameters, but the serial process seems more in line with a simple, conventional [Fermi s Golden Rule for IVR (Avouris et al. 1977 Beswick and Jortner 1981 Jortner et al. 1988 Lin 1980 Mukamel 1985 Mukamel and Jortner 1977) and RRKM theory for VP (Forst 1973 Gilbert and Smith 1990 Kelley and Bernstein 1986 Levine and Bernstein 1987 Pritchard 1984 Robinson and Holbrook 1972 Steinfeld et al. 1989)], few parameter approach. Time resolved measurements do distinguish the models because in a serial model the rises and decays of various vibronic states should be linked, whereas in a parallel one they are, in general, unrelated. Moreover, the time dependent studies allow one to determine how the rates of the IVR and VP processes vary with excitation energy, density of states, mode properties, and isotropic substitution. 

The VP rate is calculated by a restricted (to vdW modes) RRKM theory. By assuming a tight binding model for the cluster transition state, the resulting expression for the VP rate constant is (Forst 1973 Gilbert and Smith 1990 Kelley and Bernstein 1986 Levine and Bernstein 1987 Pritchard 1984 Robinson and Holbrook 1972 Steinfeld et al. 1989),... 

Gilbert, N., Hobbs, I., and Levine, J., Hydrolysis of wood using dilute sulfuric acid. Industrial and Engineering Chemistry 1952, 44 (7), 1712-1720. 

The author is indebted to his students and colleagues S. Zilkah, P.F. Bocion, R.Levin, D.G. Davis, G. Ezra, E. Lewinsohn and Y. Shaaltiel who have vastly contributed to our research in developing the conceptual and data framework for designing pre-screens. The author is the Gilbert de Botton Professor of Plant Science. 

Levine Raphael David 144, 766, 845 Levitt Michael 285 Levy Bernard 397, 398, 400, 536 Levy Mel 569,581,582,611 Lewis Gilbert Newton 6, 7, 327 Lifson Shneior 277, 289 Linderberg Jan 672,679... 

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